Bolt-threading machine.



A. M. HARRINGTON & R. P. SCOTT. BLT THREADING MAGHINE.

APPLICATION FILED JULY 3v, 191s.

1,085,577. v Patented Jan. 27, 1914.

COLUMBIA PLANOQRAPH co.. WASHINGTDN, D. c.

STATES ARTHUR M. HARRINGTON AND ROBERT F. SCOTT, OF PHILADELPHIA,PENNSYLVANIA,

ASSIGNORS TO EDWIN HAR-RINGTON, SON & CO., INC., OF PHILADELPHIA, PENN-SYLVANIA, A CORPORATION OF PENNSYLVANIA.

BOLT-THREADING MACHINE.

To all whom it may concern Be it known that we, ARTHUR M. HAR- mxcrosTand ROBERT F. SCOTT, citizens of the United States, and residents of thecity of Philadelphia, county of Philadelphia, and State of Pennsylvania,have invented certain Improvements in Bolt-Threading Machines, of whichthe following is a specification.

Our invention relates more particularly to the operations involved incutting threads on stay bolts, and its primary object is. to providesimple mechanism for regulating the operation of cutting, especiallystarting, the thread at one end of a bolt to the pitch of a threadpreviously cut on the other end, the cutting tool being guided in theoperation of forming the second thread under control of means engagingthe first thread.

In the accompanying drawings, Figurel 1 is an elevation of part of astay bolt machine embodying our improvements; Fig. 2 is an enlargedsectional view of the same taken on the line 2-2 of Fig. 1; Fig. 3 is asectional view taken on the line 3--3 of Fig. 2; and Fig. 4 is anenlarged sectional view taken on the line4-4 of Fig. 1.

The machine, as illustrated in the drawings, comprises the frame 1provided with bearings 2 and 3. A driving shaft 4 is jour naled in thebearings 2, pulleys 5 and 6 are fixed on this shaft, and straps 7 areadapted to be wound on the pulleys 5 to elevate the cutter or chaserheads 8, which are movable vertically along the guide bars 9 and 10. Ashaft 11 is journaled in the bearings 3, a pulley 12 and beveled pinions13 are xed on this shaft and a belt 14 connects the pulleys 6 and 12.The pinions 13 revolve beveled gears 15 which revolve stocks 16 fixedthereto. The stocks 16 engage the heads of and turn the bolts 17 as theheads S descend along the guide bars 9 and 10 and cut the threads, firston the point and then on the head end of the bolts.

Threaded rods or screws 18 are fixed to each head S and have a followeror block 19 engaged in adjustable relation thereto by internallythreaded sleeves 2O swiveled in the block, the latter containing anaperture 21 through which the point or top of the bolt 17 is adapted topass. A bearing 22 is fixed to the block 19 within the aperture 21 and asectional nut 23 is connected with the block, so as to be movable intoand out of engage- Speccation of Letters Patent.

Application led July 3, 1913.

Patented Jan. 27, 1914. Serial No. 777,357.

ment with the threaded point of the bolt 17, by a stem 24 movablelongitudinally in the hole 25. A disk 26 is journaled on the block 19 bythe stud 27 and is connected eccentrically, by a stud 2S with a link 29,the link being connected by a stud 30 with the nut 23. The disk isprovided with a roller 31 and a handle 31 for turning it.

A coiled compression spring 32 is seated in the socket 19 of the block19 and bears against the arm 24 fixed to the stem 24, the spring actingto retract the sectional nut 23, Then the disk 26 is turned by thehandle 31 in the direction of the arrow to the limit of- 37 is placed inthe path of the downwardly moving roller 31 when the disk 26 is in theposition required for holding the nut 23 in its inner posit-ion inengagement with the thread on the point of the bolt 17.

In operation, the chaser heads 8 move from their elevated posit-iondownwardly along the bars 9 and 10 as the stay bolts 17 are revolved bythe stocks 16. The descending heads first cut the threads on the pointsof the bolts and thereafter cut the threads on the lower or head ends inexact pitch with the threads on the upper ends by reason of theengagement with the latter threads of the sectional nuts 23. When thedescending blocks 19 and the connected parts of the follower mechanismhave finished their work, the rollers 30 engage the cams 37 which turnthe disks 26 reversely to the direction of the arrow and the springs 32act through the parts 24 and 24 to retract the nuts 23 which are held inthe withdrawn position. The respective follower mechanisms can now beelevated (clear of the bolts) with the Chaser heads.

Having described our invention, we claim:

1. In a bolt threading machine, the combination with a movable tooladapted for cutting a thread, of controlling means adapted for engaginga thread cut by said tool to regulate the further cutting operationthereof, mechanism for connecting said tool and `controlling means, andmeans for automatically disengaging said controlling means.

2. In a bolt threading machine, the combination with a movable tooladapted for cutting a thread, of controlling means adapted for engaginga thread cut by said tool to regulate the further cutting operationthereof, mechanism for connecting said tool and controlling means, andmeans comprising a cam for automatically disengaging said controllingmeans.

3. In a bolt threading machine, the combination with a movable tooladapted for threading a bolt, of controlling means adapted for engaginga thread on said bolt, and means comprising a rod for connecting saidtool and controlling means.

4. In a bolt threading machine, the combination with a movable threadcutting mechanism, guiding means whereby said mechanism is adapted to bereciprocated and means for turning a bolt to be threaded by saidmechanism, of a follower having a sectional nut adapted for engaging athread of said bolt, and means comprising tie rods for connecting saidfollower with said mechanism whereby said mechanism is caused to cut athread in pitch with the thread en` gaged by said follower.

In a machine for threading bolts, the combination with a chaser head,guides along which said head is movable by gravity and means forrevolving the bolt to be threaded by said head, of a follower, meanswhereby said follower is connected with said head so as to movetherewith, and means carried by said follower for engaging a threadwhereby said head is caused to out a thread of like pitch.

G. In a bolt threading machine, the combination with a chaser head,guiding means along which said head is adaptedrto reciprocate, and meansfor turning a bolt to be threaded by said head, of a device containingan aperture, a sectional nut connected in movable relation to saiddevice, and means for reciprocating said sectional nut into and out ofengagement with the thread of a bolt in said aperture.

7. In a bolt threading machine, the combination with a chaser head,vertical guides along which said head is movable and means for turning astay bolt, of an apertured block, means comprising threaded rods andswiveled sleeves for connecting said block in adjustable relation tosaid rods, a bearing in said block for engaging a stay bolt passingthrough the aperture therein, a sectional nut, means whereby said nut isconnected with said block, and means comprising a spring for holdingsaid nut out of its operating position.

8. In a bolt threading machine, guiding means, thread cutting meansadapted to reciprocate along said guiding means, a block containing anaperture connected with said cutting means, a sectional nut connectedwith said block so as to be movable in said aperture, means comprising alever fulcrumed on said block whereby said nut is reciprocated, a springconnected with said lever so as to move said nut, and a cam for engagingsaid lever and shifting said nut.

In testimony whereof we have hereunto set our names this 26th day ofJune, 1913, in the presence of the subscribing witnesses.

ARTHUR M. HARRlNGTON. ROBT. F. SCOTT.

lVtnesses Jos. Gr. DENNY, Jr., Gro. A. CUNNEY.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

